I wouldn't go any bigger than 1.5" for a face mill, make sure you go for a high positive cutter or you will have problems.
Instead of a 1" indexable, just run 3/4" or even only 1/2" cobalt rougher's. They are very affordable, can haul major a$$ and will last forever in aluminum. You would probably have better luck running a small rougher than an indexable endmill.
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